CONTENTS. 
PART III. 
XXI. A Memoir on the Single and Double Theta-Functions. By A. Cayley, F.R.S., 
Sadlenan Professor of Pure Mathematics in the University of Cam¬ 
bridge . page 897 
XXII. Revision of the Atomic Weight of Aluminium. By J. W. Mallet, F.R.S., 
Professor of Chemistry in the University of Virginia ....... 1003 
XXIII. Description of some Remains of the Gigantic Land-Lizard (Megalania prisca, 
Owe A), from Australia. — Part II. By Professor Owen, C.B., F.P.S., &c. 1037 
XXIY. Cn the Ova of the Echidna Hystrix. By Professor Owen, C.B., 
F.RS.,&c .' . 1051 
XXV. On the Determination of the Constants of the Cup Anemometer by Experiments 
with a Whirling Machine — Part II. By T. It. Robinson, D.D., F.P.S., &c. 1055 
XXVI. On the Dynamo-electric Current, and on Certain Means to Lmprove its Steadi¬ 
ness. By William Siemens, D.C.L., F.R.S. ... . 1071 
Index to Volume . 1089 
